Fuse plug



Aug.16, 1927 i CAHN FUSE PLUG Filed July 17, 1925 IN VEN TOR.

7 BY E15- ATTORNEY Patented Aug. 16, 1927; i

] UNITED STATES LEON J. cum, or "NEW YORK, N. Y. I

was mue'.

Application filed July 17, 1925, Serial No. 44,208.

The present invention relates to improvements in fuse plugs, particularly base fuse plugs, and it is the principal object of the invention to combine a standard-lamp base with a composition plug which uses an exchangeable fuse wire, so that thesame plug may be used over again'by the insertion of a new wire.

Another object of the invention is the provision of a fuse plug in which a readily exchangeable fuse wire is firmly guided to make contact with the shell and contact plate of the plug yet allowing a' quick exchange of the wire.

A further object ofthe invention is the provision of an exchangeable wire for fuse plugs which may be used with the various types of plugs, as for instance hexagonal for up to 7 amperes and circular for over 7 amperes with equal efiiciency.

These and other objects and advantages of my invention will become more fully known as the description thereof proceeds,

and will then be specifically defined in the appended. claims.

In the accompanying drawing, forming a material part of this disclosure: Figure 1 shows detail views of aplug shell-and a plug socket separated therefrom,

, constructed according to the present invention, in which an exchangeable fuse is located.

Figure 2 is a longitudinal sectional side elevation of a fuse plug constructed accorda socket member of a with over 7amperes.

Figure 6 is a sectional view o f'a modified form of fuse plug.

The fuse plug constructed according, to the present invention comprises the-outer brass shell or mantle 10 having the usual thread 11, the outer 'one for screwing-the plug into the socket of the fuse box, and the inner one for screwing the .plug shell onto.

its socket member 12 of composition or any similar suitable insulating material, having its outer face threaded, as at 13, for engagement with the inner thread of the shell,

The contact plate 14 of the shell is attached to the end of the same in the usual manner and has a centrally located opening 15. The socket member 12 of the plug has a head or knob formed therewith, designated 16 the outer periphery of which is knurled or corrugated to facilitate the operation of the plug when screwing the same into a box socket or unscrewing it therefrom etc. A

mica or similar. plate 17 rests upon an inner shoulderof, the head part of socket member 12, and the. side wall. of the socket member is formed with a longitudinal slot 1E} aving its bottom wall beveled as at 19, while its upper end runs into a groove 20, the lower end of the wall of which is adapted to be engaged by the hook end 21 of a fuse wire 22, the upper end of whichis engaging the therein metallicall'y in any suitable manner as indicated at 23; The mica plate 17 may be made of a number of layers, as illustrated on the drawing, and these layers are adapted against the new mica discs to hold them against displacement. y

The fuse plug illustrated in Figures 8 and hole or opening 15 and adapted to be held 4 has the socket member 24 thereof formed with a hexagonal head part 25 and a knurled outer head flange 26. and its side wall has a longitudinal extending opening or slot 27 formed therein ending 1nto an upper (groove,

the end wall 28 of which is adapte to be engaged by the hook-shaped end of a fuse wire 29 leading to the contact plate of the shell in which it is secured in the usual manner, the inner mica plate 30 is seated in the socket and held therein in any of the well known ways The hexagonal form of plug head is used with up to 7' amperes,

ure 5 is used with more or above 7 amperes.

In the modified form of the invention illustrated in Figure 6, the fuse plug socket member 31v is of the round or circular form and has its side wall formed with a horizontally extending slot 32, ending at one end into a vertical slot 33 so that the end of the Wire 34 is guided about the outer mantle of the socket member, preferably in the threads thereof and held therein, while -while the circular form as illustrated in Figthe opposite end of'the wire is guided in slot 33 to above the contact plate in the usual manner.

While Ihave shown and described as an example the preferred form of my invention,

a composition lug to be combined with 'a' standard lamp ase, the operation of which will be clear from the above description without further explanation, it is to be understood, that such changes as come within formed with an.inner shoulder, mica discs resting -on said inner shoulder, said socket having a longitudinal slot on the outer discs, communicating with said longitudinal slot, a fuse wire hooked through said aperture, and guided in said longitudinal slot, and a shell having its inner surface in conv tact with said fuse wire disposed over said socket, said mica discs being supported by frictioned engagement with the inner surface of said socket and by said fuse wire.

2. A fuse plug comprising a substantially tubular member formed with an inner shoulder and having an external'longitudinal slot therein and an aperture through the walls thereof communicating with said tubular member, and a-fuse wire attached at one end to said contact plate disposed through said aperture intermediate its ends and guided in said longitudinal slot in adjacency with the wall of said shell, said mica discs being restrained from inward movement by frictional engagement with the inner walls of said tubular member and by contact with said fuse wire.

3. A fuse plug comprising a substantially tubular member formed with an inner shoulder an external longitudinal slot and .an aperture communicating with said slot wall, and an aperture ad acent said. mica.

and the interior of said tubular member, a plurality of superimposed discs disposed in said tubular member in engagement with said shoulder, and a fuse wire disposed through said aperture and engaging said discs, said discs being restrained from outward movement relative to said tubularmember by said shoulder and from inward movement by said fuse wire and by frictional engagement with the Walls of said tubular member. v I

In testimony WhereofI have affixed my signature. 7

LEON J I OAHN. 

